Long SMS
Long SMS are concatenated standard SMS. A Long SMS can be up to 3 standard SMS in length. However, since the SMS need to contain some information about the concatenation, each standard SMS can contain up to 153 characters when concatenated.
So, a Long SMS consisting of two SMS can contain up to 306 characters.
A Long SMS consisting of three SMS can contain up to 459 characters.
Normally, a Long SMS is received by the recipient as a series of separate SMSs. However, on some newer mobiles, they will be received as one long SMS.
To use Long SMS, enable the option Allow Long Messages. Please note that using Long SMS is not recommended. Please first test reception. Not all mobile networks support Long SMS.
Unfortunately, Long SMS is not supported for US mobile number destinations.